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package bsdp
import (
"fmt"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// Implements the BSDP option default boot image ID, which tells the client
// which image is the default boot image if one is not selected.
// OptDefaultBootImageID contains the selected boot image ID.
type OptDefaultBootImageID struct {
ID BootImageID
}
// ParseOptDefaultBootImageID constructs an OptDefaultBootImageID struct from a sequence of
// bytes and returns it, or an error.
func ParseOptDefaultBootImageID(data []byte) (*OptDefaultBootImageID, error) {
if len(data) < 6 {
return nil, dhcpv4.ErrShortByteStream
}
code := dhcpv4.OptionCode(data[0])
if code != OptionDefaultBootImageID {
return nil, fmt.Errorf("expected option %v, got %v instead", OptionDefaultBootImageID, code)
}
length := int(data[1])
if length != 4 {
return nil, fmt.Errorf("expected length 4, got %d instead", length)
}
id, err := BootImageIDFromBytes(data[2:6])
if err != nil {
return nil, err
}
return &OptDefaultBootImageID{*id}, nil
}
// Code returns the option code.
func (o *OptDefaultBootImageID) Code() dhcpv4.OptionCode {
return OptionDefaultBootImageID
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptDefaultBootImageID) ToBytes() []byte {
serializedID := o.ID.ToBytes()
return append([]byte{byte(o.Code()), byte(len(serializedID))}, serializedID...)
}
// String returns a human-readable string for this option.
func (o *OptDefaultBootImageID) String() string {
return fmt.Sprintf("BSDP Default Boot Image ID -> %s", o.ID.String())
}
// Length returns the length of the data portion of this option.
func (o *OptDefaultBootImageID) Length() int {
return 4
}
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